Method of deriving qcl assumption in multi-panel transmission and related device

ABSTRACT

A method of deriving a Quasi-CoLocation (QCL) assumption for a user equipment (UE) in multi-panel transmission is disclosed. The method comprises obtaining a plurality of control resource set (CORESET) groups from a network of the wireless communication system, determining a default QCL assumption for demodulation reference signal (DM-RS) port(s) of at least one physical downlink share channel (PDSCH), reception scheduled by a scheduling physical downlink control channel (PDCCH) according to a CORESET of one of the plurality of CORESET groups when a time offset between a reception of downlink control information (DCI), in the scheduling PDCCH and the at least one PDSCH reception is less than a threshold, wherein at least one of the plurality of CORESET groups includes at least one CORESET for indicating a QCL assumption, and applying the default QCL assumption for reception of the DM-RS port(s) of the at least one PDSCH.

CROSS-REFERENCE TO RELATED APPLICATION(S)

The present application claims the benefit of and priority to U.S.provisional Patent Application Ser. No. 62/830,667 filed on Apr. 8,2019, entitled “Panel-specific Fallback Mechanism for PDSCH SpatialReceiving Filter,” (hereinafter referred to as “the '667 provisional”).The disclosure of the '667 provisional is hereby incorporated fully byreference into the present disclosure.

FIELD

The present disclosure generally relates to wireless communications, andmore particularly, to a method of deriving Quasi-CoLocation (QCL)assumption in multi-panel transmission and a related device.

BACKGROUND

NR Rel-15 supports beam management with Transmission ConfigurationIndication (TCI) framework, by which different types of QCL assumptionis indicated. Among these QCL types, QCL-typeD is related to spatialreceiving characteristics that can be utilized by a user equipment (UE)for receiving a target reference signal/channel.

For physical downlink (DL) shared channel (PDSCH) reception, QCL-typeD(i.e. beam scheme) can be indicated in a physical DL control channel(PDCCH) payload. However, before DL control information (DCI) of thePDCCH is parsed, the UE does not know a default beam for PDSCHreception, as illustrated in FIG. 1, which is a schematic diagramillustrating relation between PDSCH scheduling delay and DCI parsinglatency.

As shown in FIG. 1, PDSCH scheduling latency is longer than DCI parsinglatency in case A, so that the QCL-typeD indicated in the PDCCH can beutilized for receiving the scheduled PDSCH. However, for case B, PDSCHscheduling latency is shorter than DCI parsing latency, which results inthe UE not being able to obtain QCL-typeD in time for PDSCH reception.

SUMMARY

The present disclosure is directed to a method of deriving QCLassumption in multi-panel transmission and a related device.

According to an aspect of the present disclosure, a method of deriving aQuasi-CoLocation (QCL) assumption in multi-panel transmission for a userequipment (UE) is disclosed. The method comprises obtaining a pluralityof control resource set (CORESET) groups from a network of a wirelesscommunication system, determining a default QCL assumption fordemodulation reference signal (DM-RS) port(s) of at least one physicaldownlink shared channel (PDSCH) reception scheduled by a schedulingphysical downlink control channel (PDCCH) according to a CORESET of oneof the plurality of CORESET groups, when a time offset between areception of downlink control information (DCI) in the scheduling PDCCHand the at least one PDSCH reception is less than a threshold, whereinat least one of the plurality of CORESET groups includes at least oneCORESET indicating the QCL assumption, and applying the default QCLassumption for reception of the DM-RS port(s) of the at least one PDSCH.

According to another aspect of the present disclosure, a user equipment(UE) for deriving Quasi-CoLocation (QCL) assumption in multi-paneltransmission is disclosed. The UE comprises a processor, for executingcomputer-executable instructions, and a non-transitory machine-readablemedium, coupled to the processor, for storing the computer-executableinstructions, wherein the computer-executable instructions instruct theprocessor to obtain a plurality of control resource set (CORESET) groupsfrom a network of a wireless communication system, determine a defaultQCL assumption for demodulation reference signal (DM-RS) port(s) of atleast one physical downlink shared channel (PDSCH) reception scheduledby a scheduling physical downlink control channel (PDCCH) according to aCORESET of one of the plurality of CORESET groups when a time offsetbetween a reception of downlink control information (DCI) in thescheduling PDCCH and the at least one PDSCH reception is less than athreshold, wherein at least one of the plurality of CORESET groupsincludes at least one CORESET indicating the QCL assumption, and applythe default QCL assumption for reception of the DM-RS port(s) of the atleast one PDSCH.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects of the exemplary disclosure are best understood from thefollowing detailed description when read with the accompanying figures.Various features are not drawn to scale, dimensions of various featuresmay be arbitrarily increased or reduced for clarity of discussion.

FIG. 1 is a schematic diagram illustrating a relationship between PDSCHscheduling delay and DCI parsing latency, in accordance with related artmethods.

FIG. 2 is a flowchart illustrating a method for a UE to perform QCLassumption operation in multi-panel transmission, in accordance withexample implementations of the present disclosure.

FIG. 3 is a schematic diagram illustrating panel-specific connectionwith different TRPs in accordance with example implementations of thepresent disclosure.

FIG. 4 is a schematic diagram illustrating a panel-specific default beamwhere two CORESET groups are configured, in accordance with exampleimplementations of the present disclosure.

FIG. 5 is a block diagram illustrating a node for wirelesscommunication, in accordance with example implementations of the presentdisclosure.

DETAILED DESCRIPTION

The following description contains specific information pertaining toexemplary implementations in the present disclosure. The drawings andtheir accompanying detailed description are directed to exemplaryimplementations. However, the present disclosure is not limited to theseexemplary implementations. Other variations and implementations of thepresent disclosure will occur to those skilled in the art. Unless notedotherwise, like or corresponding elements in the figures may beindicated by like or corresponding reference numerals. Moreover, thedrawings and illustrations are generally not to scale and are notintended to correspond to actual relative dimensions.

For the purpose of consistency and ease of understanding, like featuresare identified (although, in some examples, not shown) by numerals inthe exemplary figures. However, the features in differentimplementations may be different in other respects, and therefore shallnot be narrowly confined to what is shown in the figures.

The phrases “in one implementation,” and “in some implementations,” mayeach refer to one or more of the same or different implementations. Theterm “coupled” is defined as connected, whether directly or indirectlyvia intervening components, and is not necessarily limited to physicalconnections. The term “comprising” means “including, but not necessarilylimited to” and specifically indicates open-ended inclusion ormembership in the described combination, group, series and equivalents.

Additionally, for the purposes of explanation and non-limitation,specific details, such as functional entities, techniques, protocols,and standards are set forth for providing an understanding of thedescribed technology. In other examples, detailed description ofwell-known methods, technologies, system, and architectures are omittedso as not to obscure the description with unnecessary details.

Persons skilled in the art will recognize that any described networkfunction(s) or algorithm(s) may be implemented by hardware, software ora combination of software and hardware. Described functions maycorrespond to modules that are software, hardware, firmware, or anycombination thereof. The software implementation may comprise computerexecutable instructions stored on computer readable medium such asmemory or other type of storage devices. For example, one or moremicroprocessors or general-purpose computers with communicationprocessing capability may be programmed with corresponding executableinstructions and carry out the described network function(s) oralgorithm(s). The microprocessors or general-purpose computers may beformed of applications specific integrated circuitry (ASIC),programmable logic arrays, and/or using one or more digital signalprocessor (DSPs). Although some of the disclosed implementations aredirected to software installed and executing on computer hardware,alternative implementations as firmware or as hardware or combination ofhardware and software are well within the scope of the presentdisclosure.

The computer readable medium includes but is not limited to randomaccess memory (RAM), read only memory (ROM), erasable programmableread-only memory (EPROM), electrically erasable programmable read-onlymemory (EEPROM), flash memory, compact disc (CD) read-only memory (CDROM), magnetic cassettes, magnetic tape, magnetic disk storage, or anyother equivalent medium capable of storing computer-readableinstructions.

A radio communication network architecture (e.g. a long term evolution(LTE) system, an LTE-Advanced (LTE-A) system, an LTE-A Pro system, or anNew Radio system) typically includes at least one base station (BS), atleast one UE, and one or more optional network elements that provideconnection with a network. The UE communicates with the network (e.g. acore network (CN), an evolved packet core (EPC) network, an EvolvedUniversal Terrestrial (ET) Radio Access Network (RAN) (E-UTRAN), aNext-Generation (NG) Core (NGC), 5G CN (5GC), or an internet via a RANestablished by the BS.

It should be noted that, in the present disclosure, a UE may include,but is not limited to, a mobile station, a mobile terminal or device, auser communication radio terminal. For example, a UE may be a portableradio equipment, that includes, but is not limited to, a mobile phone, atablet, a wearable device, a sensor, or a personal digital assistant(PDA) with wireless communication capability. The UE is configured toreceive and transmit signals over an air interface to one or more cellsin a RAN.

ABS may include, but is not limited to, a node B (NB) as in theUniversal Mobile Telecommunication System (UMTS), an evolved node B(eNB) as in the LTE-A, a radio network controller (RNC) as in the UMTS,a BS controller (BSC) as in the Global System for Mobile communications(GSM)/GSM EDGE RAN (GERAN), an NG-eNB as in an E-UTRA BS in connectionwith the 5GC, a next generation node B (gNB) as in the 5G-RAN, and anyother apparatus capable of controlling radio communication and managingradio resources within a cell. The BS may connect to serve the one ormore UEs via a radio interface to the network.

ABS may be configured to provide communication services according to atleast one of the following radio access technologies (RATs): WorldwideInteroperability for Microwave Access (WiMAX), GSM (often referred to as2G), GERAN, General Packet Radio Service (GRPS), UMTS (often referred toas 3G) according to basic wideband-code division multiple access(W-CDMA), high-speed packet access (HSPA), LTE, LTE-A, evolved LTE(eLTE), New Radio (NR, often referred to as 5G), and/or LTE-A Pro.However, the scope of the present disclosure should not be limited tothese protocols.

The BS is operable to provide radio coverage to a specific geographicalarea using a plurality of cells forming the RAN. The BS supports theoperations of the cells. Each cell is operable to provide services to atleast one UE within radio coverage of the cell. More specifically, eachcell (often referred to as a serving cell) provides services to serveone or more UEs within the cell's radio coverage, (e.g. each cellschedules the DL and optionally uplink (UL) resources to at least one UEwithin the cell's radio coverage for DL and optionally UL packettransmissions). The BS can communicate with one or more UEs in the radiocommunication system via the plurality of cells. A cell may allocatesidelink (SL) resources for supporting proximity service (ProSe). Eachcell may have overlapped coverage areas with other cells.

FIG. 2 illustrates a method 200 for a UE to perform QCL assumptionderivation in multi-transmit-receive point (TRP) (multi-TRP)/paneltransmission according to the present disclosure. In action 202, the UEobtains a plurality of control resource set (CORESET) groups from a BS.In action 204, the UE determines a default QCL assumption for DM-RSport(s) of at least one PDSCH reception scheduled by a scheduling PDCCHaccording to a CORESET of one of the plurality of CORESET groups when atime offset between a reception of DCI in the scheduling PDCCH and theat least one PDSCH reception is less than a threshold, where the CORESETgroup includes at least one CORESET for indicating a QCL assumption. Inaction 206, the UE applies the default QCL assumption for reception ofthe DM-RS port(s) of the at least one PDSCH.

The method 200 achieves UE-based QCL assumption. In detail, multipleCORESET groups are configured to the UE, and CORESET(s) in a CORESETgroup are associated to the same transmit-receive point, TRP. A defaultQCL assumption (e.g. beam scheme) for PDSCH reception is determinedaccording to a QCL type-D of individual groups of CORESET(s) when thetime offset between the reception of DCI in the PDCCH and the PDSCHreception is less than the threshold (e.g. the PDSCH scheduling delay isless than the DCI parsing latency). In other words, a panel-specificdefault beam is determined according to a group of CORESET(s) belongingto a same TRP. Default beams for PDSCH receptions from different TRPsare independently determined according to each of the CORESET groups.

It is noted that, one PDCCH may be utilized to schedule one PDSCH or aplurality of PDSCHs, which is not limited in QCL assumption derivation.It is noted that the term “beam” refers to QCL assumption made by theUE. QCL parameters include a plurality of types in NR. QCL type-D isusually referred to by the term “beam.” For receiving a signal/channelproperly, other QCL parameter types may also be needed. However, whenderiving a QCL type-D assumption, other QCL parameters are derived byfollowing a similar approach as for deriving a QCL type-D assumption. Inthis document, “beam” is utilized to express a QCL type-D assumption orQCL parameters interchangeably. It is noted that when referring to QCLtype-D specifically, “beam” can be also expressed as “spatial filter.”Various cases are disclosed.

In multi-TRP transmission, a UE may be equipped with multiple panels anddifferent UE panels may communicate with a RAN via different TRPs, asillustrated in FIG. 3. In addition, CORESET(s) configured to a UE may begrouped. In one implementation, the CORESET grouping is configured by aBS with radio resource control (RRC) signaling. In some implementations,the RRC singling includes a CORESET configuration indicating differentvalues of a “CORESETPoolIndex” parameter, which could be interpreted asdifferent CORESET groups/multiple CORESET groups are configured to theUE. In one implementation, individual PDSCHs are scheduled by CORESETsfrom individual CORESET groups by using fully/partially/non-overlappedphysical resources for transmission.

With reference to FIG. 4, the panel-specific default beam is determinedaccording to the QCL type-D assumption of a CORESET group when the timeoffset between the reception of DCI in the PDCCH and the PDSCH receptionis less than the threshold. In FIG. 4, two CORESET groups are configuredto the UE with individual CORESET groups consisting of only one CORESET.It is noted that, in some implementations, a CORESET group is notlimited to one CORESET, but also a plurality of CORESETs. In addition,the UE has capability of simultaneous reception with two QCLassumptions, so that each UE panel is associated with an individual QCLassumption. For example, QCL #1 is associated with panel #1, and QCL #2is associated with panel #2. PDSCH #1 is scheduled via CORESET #1 andPDSCH #2 is scheduled via CORESET #2. Therefore, a PDSCH #1 default beamis determined according to the CORESET #1 and is not related to CORESET#2, and vice-versa for PDSCH #2. It is noted that “panel” is aconceptual term for UE antenna implementation. It is assumed that apanel is a basic unit for UE beamforming. A panel typically consists ofa plurality of antenna elements. In one implementation, a beam can beformed by a panel and in order to form two beams simultaneously, twopanels are needed. Such simultaneous beamforming from multiple panels issubject to UE capability.

In one implementation, the UE may assume that the DM-RS ports of thePDSCH are quasi co-located with the RS(s) with respect to the QCLparameter(s) for indicating PDCCH quasi co-location of the CORESETindicated by a monitored search space with the lowest CORESET-identifier(ID) in the latest slot in which one or more CORESETs within the activebandwidth part (BWP) of the CORESET group are monitored by the UE whenthe time offset between the reception of DCI in the PDCCH and the PDSCHreception is less than the threshold. A QCL-typeD assumption may be anexample applied in the implementation above. That is, in terms of apanel-specific default beam for the PDSCH, a same QCL-typeD assumptionof the QCL parameter(s) of the corresponding PDCCH is applied.

It is noted that the UE may report “multi-TRP” capability to the BS, sothat the BS may configure the UE accordingly. The “multi-TRP” capabilitymay be further associated with different UE capabilities, such as anenhancement for receiving transmission from multiple TRPs simultaneouslyvia frequency division multiplexing (FDM) or space division multiplexing(SDM), for increasing an amount of PDCCH blind decoding, and forincreasing a number of control channel elements (CCEs).

Furthermore, the “multi-TRP” capability may be interpreted as at leastone of allowing one TCI code point in a DCI field to be associated withmultiple TCI states, allowing simultaneous PDSCH transmission withphysical resources being fully/partially/non-overlapped, and supportinga panel-specific default beam for the UE capable of simultaneousreception from multiple TRPs.

In some implementations, the UE may report “panel-specific default beam”capability to the BS. The “panel-specific default beam” capability maybe interpreted as supporting the UE-based QCL assumption describedearlier for UE capable of simultaneous PDSCH reception from multipleTRPs.

Therefore, a BS may trigger the UE to perform the QCL assumptionderivation with an RRC configuration. For example, the BS transmits anRRC signal for configuring multiple CORESET groups (e.g. by the“CORESETPoolIndex” parameter) to the UE and this triggers the UE toperform QCL assumption derivation if the UE has reported “panel-specificdefault beam” capability to the BS. In one implementation, the UE maysupport “multi-TRP” capability, and the BS transmits an RRC signalindicating “multi-TRP” operation to the UE. In other implementations,the BS transmits an RRC signal indicating “panel-specific default beam”operation for PDSCH reception to the UE. In this way, when anycombination of abovementioned RRC configuration(s) is received, the UEperforms the abovementioned QCL assumption derivation when the timeoffset between the reception of DL DCI in the PDCCH and the PDSCHreception is less than a capability-related threshold (e.g. a“timeDurationForQCL” parameter).

In addition, the UE applies the same PDCCH beam for corresponding PDSCHreception, when scheduled by DCI format 1_0 and the time offset betweenthe reception of the DL DCI and the corresponding PDSCH reception isequal to or greater than the capability-related threshold. In otherimplementations, the UE applies the indicated beam in the received DCIfor the corresponding PDSCH reception when scheduled by DCI format 1_1and the time offset between the reception of the DL DCI and thecorresponding PDSCH reception is equal to or greater than the threshold.

In the present disclosure, a single PDCCH may be utilized to scheduleindividual PDSCHs from individual TRPs. To provide the UE with aQCL-typeD assumption for receiving PDSCHs corresponding to respectiveTRPs, a TCI code point in the DCI field may be associated with multipleTCI states. In addition, since there is only one PDCCH, the implicitlyindicated Physical UL Control Channel (PUCCH) resource for HybridAutomatic Repeat request (HARQ)-acknowledgment (ACK) bits transmissionof the two scheduled PDSCH is semi-statically associated with thescheduling PDCCH. In this way, UE panels for transmitting the PUCCHresource and for receiving the scheduling PDCCH may not be dynamicallyassociated. Therefore, a panel-specific PUCCH resource selection isrequired.

For panel-specific PUCCH resource selection, the information indicatingwhere to find the PUCCH resource is provided in the received DCI, in amedium access control (MAC)-control element (CE), or is directly orindirectly related to a CORESET index or a CORESET group index which isutilized as an identifier for differentiating PUCCH resource groups orpanels. Various cases are disclosed.

For panel-specific PUCCH resource selection via DCI signaling, a new oran existing DCI field in at least DCI format 1_0 and 1_1 may beused/reused for dynamically providing information to indicate a PUCCHresource group from which a PUCCH resource is selected for correspondingHARQ-ACK bit feedback. In one implementation, the existing DCI field maybe an extension of a “PUCCH resource indicator” field. For example, abit length of the “PUCCH resource indicator” field is extended and isapplied as the most significant bit (MSB) or least significant bit (LSB)for group indication.

For panel-specific PUCCH resource selection via MAC-CE signaling, a newor an existing MAC-CE format may be applied/reused for providinginformation to indicate re-association of a PUCCH resource group to a“PUCCH resource indicator” field. For a received “PUCCH resourceindicator” field in DCI, a PUCCH resource is selected from theassociated PUCCH resource group indicated via the MAC-CE. The existingMAC CE format may be a reserved bit for indication. The new MAC CEformat may be required of a new logical channel ID (LCD) for identifyingthe purpose for indicating re-association of a PUCCH resource group tothe “PUCCH resource indicator” field.

In addition, a new or an existing MAC-CE format may be applied/reusedfor providing information to indicate re-association of a PUCCH resourceto a PUCCH resource group. Therefore, for a received “PUCCH resourceindicator” field in DCI, a PUCCH resource is selected from theassociated PUCCH resource group indicated via the MAC-CE. The existingMAC CE format may use a reserved bit for indication. The new MAC CEformat may be required of a new LCID for identifying the purpose forindicating re-association of a PUCCH resource group to the “PUCCHresource indicator” field.

Moreover, for either DCI-based or MAC-CE-based indication, theabovementioned information may be explicitly or implicitly linked topanel information or to PUCCH resource groups. In other words, the PUCCHresource groups and the panel information may be further associatedexplicitly or implicitly.

In one implementation, the information may be a CORESET index or aCORESET group index which is utilized as a direct or indirect identifierfor differentiating PUCCH resource groups or panels.

In one implementation, the information provides a reference signalresource index which is associated with panel(s), such as soundingreference signal (SRS), channel state information (CSI)-reference signal(RS), synchronization signal block (SSB).

In one implementation, the information provides a reference signalresource set index which is associated with panel(s), such as an SRSresource set index and a CSI-RS resource set index.

In one implementation, the information indicates an antenna panel indexdirectly. For example, the antenna panel index includes antenna elementswhich are connected to a same transceiver, antenna elements forming anantenna port, or antenna elements belonging to a same physical board.

In one implementation, the information indicates a TCI.

In other implementations, the information is associated with a subset ofpanel(s), where the subset of panel(s) is selected via other signaling,for example, MAC-CE.

FIG. 5 illustrates a node 500 for wireless communication according tothe present disclosure.

As illustrated in FIG. 5, the node 500 may include a transceiver 520, aprocessor 526, memory 528, one or more presentation components 534, andat least one antenna 536. The node 500 may also include an RF spectrumband module, a BS communications module, a network communicationsmodule, and a system communications management module, input/output(I/O) ports, I/O components, and a power supply (not shown). Each ofthese components may be in communication with each other, directly orindirectly, over one or more buses 540. The node 500 may be a UE or a BSthat performs various disclosed functions as illustrated in FIG. 2.

The transceiver 520 includes a transmitter 522 (with transmittingcircuitry) and a receiver 524 (with receiving circuitry) and may beconfigured to transmit and/or receive time and/or frequency resourcepartitioning information. The transceiver 520 may be configured totransmit in different types of subframes and slots including, but notlimited to, usable, non-usable and flexibly usable subframes and slotformats. The transceiver 520 may be configured to receive data andcontrol channels.

The node 500 may include a variety of computer-readable media.Computer-readable media may be any media that can be accessed by thenode 500 and include both volatile and non-volatile media, removable andnon-removable media. Computer-readable media may include computerstorage media and communication media. Computer storage media includesboth volatile and non-volatile, as well as removable and non-removablemedia implemented in any method or technology for storage of informationsuch as computer-readable instructions, data structures, program modulesor other data.

Computer storage media includes RAM, ROM, EEPROM, flash memory or othermemory technology, CD-ROM, digital versatile disks (DVD) or otheroptical disk storage, magnetic cassettes, magnetic tape, magnetic diskstorage or other magnetic storage devices. Computer storage media doesnot include a propagated data signal. Communication media typicallyembodies computer-readable instructions, data structures, programmodules or other data in a modulated data signal such as a carrier waveor other transport mechanism and includes any information deliverymedia. The term “modulated data signal” means a signal that has one ormore of its characteristics set or changed in such a manner as to encodeinformation in the signal. Communication media includes wired media suchas a wired network or direct-wired connection, and wireless media suchas acoustic, radio frequency (RF), infrared and other wireless media.Combinations of any of the disclosed media should be included within thescope of computer-readable media.

The memory 528 may include computer-storage media in the form ofvolatile and/or non-volatile memory. The memory 528 may be removable,non-removable, or a combination thereof. Memory includes solid-statememory, hard drives, and optical-disc drives. As illustrated in FIG. 5,the memory 528 may store computer-readable, computer-executableinstructions 532 (e.g., software codes) that are configured to cause theprocessor 526 (e.g., processing circuitry) to perform various disclosedfunctions. Alternatively, the instructions 532 may be configured tocause the node 500 (e.g., when compiled and executed) to perform variousdisclosed functions.

The processor 526 may include an intelligent hardware device (e.g., acentral processing unit (CPU), a microcontroller, an ASIC, etc.) Theprocessor 526 may include memory. The processor 526 may process the data530 and the instructions 532 received from the memory 528, andinformation received via the transceiver 520, the base bandcommunications module, and/or the network communications module. Theprocessor 526 may also process information to be sent to the transceiver520 for transmission via the antenna 536, to the network communicationsmodule for transmission to a CN.

One or more presentation components 534 present data to a person orother device. Presentation components 534 include a display device,speaker, printing component, and vibrating component.

From the previous disclosure, it is evident that various techniques canbe utilized for implementing the concepts of the present disclosurewithout departing from the scope of those concepts. Moreover, while theconcepts have been described with specific reference to certainimplementations, a person of ordinary skill in the art would recognizethat changes can be made in form and detail without departing from thescope of those concepts. As such, the disclosure is to be considered inall respects as illustrative and not restrictive. It should also beunderstood that the present disclosure is not limited to the particulardescribed implementations, but that many rearrangements, modifications,and substitutions are possible without departing from the scope of thepresent disclosure.

What is claimed is:
 1. A method of deriving a Quasi-CoLocation (QCL)assumption in multi-panel transmission for a user equipment (UE), themethod comprising: obtaining a plurality of control resource set(CORESET) groups from a network of a wireless communication system;determining a default QCL assumption for demodulation reference signal(DM-RS) port(s) of at least one physical downlink shared channel (PDSCH)reception scheduled by a scheduling physical downlink control channel(PDCCH) according to a CORESET of one of the plurality of CORESETgroups, when a time offset between a reception of downlink controlinformation (DCI) in the scheduling PDCCH and the at least one PDSCHreception is less than a threshold, wherein at least one of theplurality of CORESET groups includes at least one CORESET indicating thedefault QCL assumption; and applying the default QCL assumption forreception of the DM-RS port(s) of the at least one PDSCH.
 2. The methodof claim 1, wherein the default QCL assumption includes a QCL type-Dparameter.
 3. The method of claim 1, wherein the at least one CORESETincluded in the at least one of the plurality of CORESET groups isassociated with a same transmit-receive point (TRP).
 4. The method ofclaim 1, wherein the plurality of CORESET groups is configured by thenetwork to the UE through radio resource control (RRC) signalingincluding a CORESET configuration indicating different values of aCORESETPoolIndex parameter.
 5. The method of claim 1, wherein thedetermining the default QCL assumption comprises: determining that thedefault QCL assumption is associated with QCL parameter(s) utilized forPDCCH QCL indication of a CORESET indicated via a monitored search spacewith a lowest CORESET index of the plurality of CORESET groups in alatest slot within an active bandwidth part (BWP) of a serving cell whenthe time offset between the reception of the DCI in the scheduling PDCCHand the at least one PDSCH reception is less than the threshold.
 6. Themethod of claim 1, wherein the threshold includes a timeDurationForQCLparameter.
 7. The method of claim 1, wherein the determining the defaultQCL assumption comprises: determining a first default QCL assumption fora first DM-RS port(s) of a first PDSCH reception scheduled by a firstPDCCH according to a first CORESET group of the plurality of CORESETgroups; and determining a second default QCL assumption for a secondDM-RS port(s) of a second PDSCH reception scheduled by a second PDCCHaccording to a second CORESET group of the plurality of CORESET groups.8. The method of claim 1, further comprising: reporting a capability ofsupporting at least one of a panel-specific default beam for the atleast one PDSCH reception and a multi-transmit-receive point (TRP)operation for supporting simultaneous reception from multiple TRPs, tothe network.
 9. The method of claim 8, wherein the reported capabilityincludes information related to one of receiving transmission frommultiple TRPs simultaneously according to frequency divisionmultiplexing (FDM) or space division multiplexing (SDM), and allowingsimultaneous PDSCH reception with corresponding physical resources beingfully, partially or non-overlapped with each other.
 10. The method ofclaim 8, wherein the default QCL assumption is applied when radioresource control (RRC) signaling for enabling at least one ofpanel-specific default beam and multi-TRP operation is received from thenetwork.
 11. A user equipment (UE) for deriving Quasi-CoLocation (QCL)assumption in multi-panel transmission, the UE comprising: a processor,for executing computer-executable instructions; and a non-transitorymachine-readable medium, coupled to the processor, for storing thecomputer-executable instructions, wherein the computer-executableinstructions instruct the processor to: obtain a plurality of controlresource set (CORESET) groups from a network of a wireless communicationsystem; determine a default QCL assumption for demodulation referencesignal (DM-RS) port(s) of at least one physical downlink shared channel(PDSCH) reception scheduled by a scheduling physical downlink controlchannel (PDCCH) according to a CORESET of one of the plurality ofCORESET groups when a time offset between a reception of downlinkcontrol information (DCI) in the scheduling PDCCH and the at least onePDSCH reception is less than a threshold, wherein at least one of theplurality of CORESET groups includes at least one CORESET indicating thedefault QCL assumption; and apply the default QCL assumption forreception of the DM-RS port(s) of the at least one PDSCH.
 12. The UEclaim 11, wherein the at least one CORESET included in the at least oneof the plurality of CORESET groups is associated with a sametransmit-receive point (TRP).
 13. The UE of claim 11, wherein theplurality of CORESET groups is configured by the network to the UEthough radio resource control (RRC) signaling including a CORESETconfiguration indicating different values of a CORESETPoolIndexparameter.
 14. The UE of claim 11, wherein the determining the defaultQCL assumption comprises: determining that the default QCL assumption isassociated with QCL parameter(s) utilized for PDCCH QCL indication of aCORESET indicated via a monitored search space with a lowest CORESETindex of the plurality of CORESET groups in a latest slot within anactive bandwidth part (BWP) of a serving cell when a time offset betweenreception of the DCI in the scheduling PDCCH and the at least one thePDSCH reception is less than the threshold.
 15. The UE of claim 11,wherein the determining the default QCL assumption comprises:determining a first default QCL assumption for a first DM-RS port(s) ofa first PDSCH reception scheduled by a first PDCCH according to a firstCORESET group of the plurality of CORESET groups; and determining asecond default QCL assumption for a second DM-RS port(s) of a secondPDSCH reception scheduled by a second PDCCH according to a secondCORESET group of the plurality of CORESET groups.
 16. The UE of claim11, wherein the computer-executable instructions further instruct theprocessor to: report a capability of supporting at least one of apanel-specific default beam for the at least one PDSCH reception and amulti-transmit-receive point (TRP) operation for supporting simultaneousreception from multiple TRPs, to the network.
 17. The UE of claim 16,wherein the reported capability includes information related to one ofreceiving transmission from multiple TRPs simultaneously according tofrequency division multiplexing (FDM) or space division multiplexing(SDM), and allowing simultaneous PDSCH reception with correspondingphysical resources being fully, partially or non-overlapped with eachother.
 18. The UE of claim 16, wherein the computer-executableinstructions further instruct the processor to: apply the default QCLassumption when radio resource control (RRC) signaling for enabling atleast one of panel-specific default beam and multi-transmit-receivepoint (TRP) operation is received from the network.